[Gene-specific treatment approaches in amyotrophic lateral sclerosis in the present and future]

Sex biology in amyotrophic lateral sclerosis

Although sex differences in amyotrophic lateral sclerosis (ALS) have not been studied systematically, numerous clinical and preclinical studies have shown sex to be influential in disease prognosis. Moreover, with the development of advanced imaging tools, the difference between male and female brain in structure and function and their response to neurodegeneration are more definitive. As discussed in this review, ALS patients exhibit a sex bias pertaining to the features of the disease, and their clinical, pathological, (and pathophysiological) phenotypes. Several epidemiological studies have indicated that this sex disparity stems from various aetiologies, including sex-specific brain structure and neural functioning, genetic predisposition, age, gonadal hormones, susceptibility to traumatic brain injury (TBI)/head trauma and lifestyle factors.

[Amyotrophic lateral sclerosis (ALS) - diagnosis, course of disease and treatment options]

Amyotrophic lateral sclerosis (ALS) is an adult-onset motor neuron disorder which is characterized by progressive motor symptoms, such as muscle weakness, muscle atrophy and spasticity. In Germany, 6000-8000 people are affected by ALS. Between 1200 and 1600 newly diagnosed patients are expected each year. Protein deposits in the cytoplasm of motor neurons are a molecular feature of ALS. The most common protein aggregates result from excessive deposition of TDP-43. Familial ALS is present in 5 to 10 % of all ALS patients. Common causal genes include C9orf72, SOD1, FUS, and TARDBP. Genetic factors may be involved even without a family history of ALS and may be underestimated. The disease course and progression are highly variable. Symptom severity and rate of progression are determined by the ALS Functional Scale (ALSFRS-R). Beyond clinical symptoms and the patient's perception of disease burden, measurement of slow vital capacity (SVC), peak cough flow (PCF), and body mass index (BMI) are used to underscore the indications for ventilatory and nutritional interventions, as well as palliative care. The validity of the biomarker neurofilament light chain (NF-L) for estimating prognosis is currently being investigated. ALS is not curable - however, various individual treatment options have to be considered for improving survival, symptom control and social participation. The care in specialized ALS centers is recommended to ensure optimal treatment regarding symptomatic medication, assistive devices, nutrition support and ventilation therapy. Optimal care is achieved by interdisciplinary collaboration of general practitioners, specialized physicians, neurologists and ALS experts being integrated in multiprofessional care networks.

Cerebrospinal Fluid Parameters in Antisense Oligonucleotide-Treated Adult 5q-Spinal Muscular Atrophy Patients

Approval of nusinersen, an intrathecally administered antisense oligonucleotide, for the treatment of 5q-spinal muscular atrophy (SMA) marked the beginning of a new therapeutic era in neurological diseases. Changes in routine cerebrospinal fluid (CSF) parameters under nusinersen have only recently been described in adult SMA patients. We aimed to explore these findings in a real-world setting and to identify clinical and procedure-associated features that might impact CSF parameters. Routinely collected CSF parameters (leukocyte count, lactate, total protein, CSF/serum albumin quotient (QAlbumin), oligoclonal bands) of 28 adult SMA patients were examined for up to 22 months of nusinersen treatment. Total protein and QAlbumin values significantly increased in the first 10 months, independent of the administration procedure. By month 14, no further increases were detected. Two patients developed transient pleocytosis. In two cases, positive oligoclonal bands were found in the beginning and in four patients throughout the whole observation period. No clinical signs of inflammatory central nervous system disease were apparent. Our data confirm elevated CSF total protein and QAlbumin during nusinersen treatment. These alterations may be caused by both repeated lumbar punctures and the interval between procedures rather than by the medication itself. Generally, there were no severe alterations of CSF routine parameters. These results further underline the safety of nusinersen therapy.